Machine for manufacturing nerve-broaches, &amp;c.



No. 656,|80. Patented Aug. 2|, |900.

' J. H. DOWNIE.

MACHINE FUR MANUFACTURING NERVE BRACHES, 81.6.

(Application led May 25, 1900.)

(No Model.)

We; ./ttorney NI'IED STATES JAMES II. DowNIE, or DETROIT, MICHIGAN.

MACHINE FOR MANUFACTURING NERVE-BROACHES, 80C.

SPECIFICATION forming part of Letters Patent No. 656,180, dated August 21, 1900.

Application mea my 25,1900.

To @ZZ whom' it may oon/cern:

Be it known that I, JAMES I-I. DOWNIE, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Im provement in Machines for the Manufacture of Nerve-Broaches and Canal-Beamers; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artv to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention has for its object the production of a machine for -the manufacture of nerve-breaches and canal-reamers for dental purposes; and it consists of the construction, combination, and arrangement of devices hereinafter described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a view in side elevation. Fig. 2 is a view in vertical section. Fig. 3 is a detail view of a blank from which the breach is formed by said machine. Fig. 4 is a View of a completed breach manufactured by said machine. Fig. 5 is a detail view in elevation showinga modificatien'in the construction of the rolls.

The object of my invention more particularly is to provide a machine for constructing a twisted nerve-breach and canal-reamer from a suitable yblank formed from a piece ef wire or other suitable metal, the wire being rst flattened in the machine at one end thereof, the flattened end of the wire then being twisted to form the completed breach or reamer.

In the drawings, d represents any suitable supporting-frame.

bb represent any suitable rolls, the shafts c c of which are j eurnaled in the frame a, said shafts being provided at one end with gears d d, meshing the one with the other. Any suitable means may be provided for setting the rolls to a desired distance the one from the other-as, for example, a screw e. Any suitable rolls may be employed in car. rying out my invention. Upon the shaft of (indicated one of the rolls is a lever er handle at f) for operating the rolls.

To twist the blank te form the breach or vtween the-rolls. the blank isflattened te a uniform thickness.

' pleted tool.

SeralNo. 17.924. (No model.)

reamer, I employ a twisting-shaft g, provided with any suitable clutch or device (indicated ath) to engage a breach or reamer holder, (indicated at i.) The shaft is reciprocatory through an auxiliary supporting-frame fm, the shaft being also rotatable in said auxiliary frame. A pulley n is supported upon a standard p, secured to the frame a, an additional pulley q being also employed. A cord is connected at one end with the lever or handle f and is led over the pulleys q and n and engaged upon the shaft g, so as to be wound upon said shaft and unweund therefrom as the handle or lever f is oscillated in one di rection and the other.

Upon the shaft g isa tension-spring s, its tension being exerted to retract the shaft in a direction away from the rolls. vA weight t is connected by a cord u with the outer end of the shaft g, the cord u winding upon the shaft g and unwinding k therefrom as said shaft is rotated. The oscillation of the lever or handle f may be limited in any desired manner, as by the roll q and a stop o.

A blank from which the breach or reamer is constructed is indicated at w and a cempleted tool at x. The blank 'w is preferably squared and tapered at one end before being put into the machine.

The operation of the device is as fellows: The blank w, inserted in a holder t', is first drawn in between the rolls by proper movement of the lever or handle f, as by an upward movement of said lever. This movement of the blank `in between the rolls attens the'squared and taperedend of the blank as the end of the blank*V is drawn in to a desired distance be- For given sizeso'f breaches The Yshaft g, with its clutch or analogous device h, is then advanced toward the rolls and engaged with the holder t'. This may be done by simply forcing forward the shaft g. An opposite movement of the lever fwill obviously reverse the direction of the rolls, causing the movement of the blank in a direction away from therolls. At the same time the cord r is unwound from the shaft g, causing a rotation of the shaft, thereby twisting the iattened end of the blank w to form the com- It will be obvious that while the shaft g is being rotated the Iiattened end of IOG the breach is held firmly in position between the rolls, so that as the flattened blade of the blank moves outward from between the rollsit is being twisted,the twisting being continuous until the outer extremity of the blank leaves the rolls. At the same time the spring s retracts the shaft g, corresponding to the outward movement of the blank, thereby preventing the blade of the tool from buckling. It will be evident that as the leverf is moved in one direction the cord u, connecting the weight t with the shaft g, is wound thereupon, and vice versa. The construction and operation of the machine will now be readily understood. It will be seen that as the leverf is forced upward no rotation is given thereby to the shaft g, and the cord r would thereby be slack but for the weight t, the cord u being wound upon the shaft g in a direction reverse to the winding of the cord r. The weight t thereby serves to wind the cord fr upon the shaft g as the lever-fis moved upward. It will be evident, furthermore, that the twisting of the blade of the blank begins at the inner end of the iiaftened portion thereof, and as the blank is fed out of the rolls a uniform twisting is given to the tapered end of the tool, said end being twisted as it comes out of the end of the rolls. It will be seen also that the tool as it is fed out from the rolls is absolutely straight. Vhile I have described atool squared before its introduction between the rolls and a flattening of the tapered end of the tool as it is fed into the rolls, I do not limit myself solely thereto, as the blank may be of other forms, if desired.

In Fig. 5 I have shown one of the rolls formed with a V-shaped annular reeess,where by the rolls are adapted to twist a three-sided blade, and I contemplate such a construction as coming within the scope of my invention. Other forms of blades may also be twisted in a similar manner by my invention.

That I claim as my invention is- 1. A machine for manufacturing a dental implement embodyingin combination a pair of rolls to flatten a blank from which the implement is formed as it advances between the rolls, a reeiprocatory twisting-shaft, means to engage a blank with the shaft, and means to simultaneously rotate said shaft and said rolls as the blank recedes from the rolls.

2. A machine for manufacturing a dental implement embodying in combination a pair 3. A machine for manufacturing a dent-al" implement embodying in combination a pair of rolls, a lever or handle for rotating one of said rolls, gears upon the shafts of said rolls Y meshing the one with the other, a rotatable and reciprocatory twisting shaft provided with means for engaging a blank therewith, means to simultaneously rotate said twistingshaft and said rolls, said twisting-shaft provided with a tension device.

et. A machine for manufacturing a dental implement embodying in combination a pair of rolls geared one with the other, a handle or lever for operating said rolls, a twistingshaft provided with means for engaging a blank therewith, a support for said twistingshaft through which said shaft is reciprocatory,means to simultaneously rotate said shaft and said rolls, and a weight provided with a cord connecting the weight with said shaft.

5. A machine for manufacturing a dental implement embodyingin combination a pair of rolls geared the one with the other to fiatten a blank from which the implement is formed as it advances between the rolls, a lever or handle to operate said rolls, a reciprocatory twisting-shaft provided with means to engage a blank therewith, and a cord connecting said lever or handle with said shaft to simultaneously rotate said shaft and said rolls as the blank recedes from the rolls.

6. A machine for manufacturing a dental implement embodyingin combination a pair of rolls arranged to receive a blank therebetween and flatten it as the rolls are rotated in one direction, and means to twist said blank as the rolls are rotated in the opposite direction.

In testimony whereof I sign this specification in the presence of two witnesses.

JAMES II. DOVVNIE.

Witnesses:

N. S. WRIGHT, M. IIICKEY.

IOO 

